561665036 has 36 divisors (see below), whose sum is σ = 1008831600. Its totient is φ = 273592800.

The previous prime is 561665033. The next prime is 561665047. The reversal of 561665036 is 630566165.

It is a super-2 number, since 2×561665036² = 630935225329762592, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (561665033) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3719561 + ... + 3719711.

It is an arithmetic number, because the mean of its divisors is an integer number (28023100).

Almost surely, 2^561665036 is an apocalyptic number.

It is an amenable number.

561665036 is a deficient number, since it is larger than the sum of its proper divisors (447166564).

561665036 is a wasteful number, since it uses less digits than its factorization.

561665036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462 (or 381 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 38.

The square root of 561665036 is about 23699.4733274814. The cubic root of 561665036 is about 825.0731669421.

The spelling of 561665036 in words is "five hundred sixty-one million, six hundred sixty-five thousand, thirty-six".